Stochastic Electrical Detection of Single Ion-Gated Semiconducting Polymers.
Stochastic Electrical Detection of Single Ion-Gated Semiconducting Polymers.
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单离子门控半导体聚合物的随机电学检测。
DOI：
10.1002/adma.202307912
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发表时间：
2023
期刊：
影响因子：
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通讯作者：
Lemay,SergeG
中科院分区：
文献类型：
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作者：
Nieuwenhuis,AbF;DuarteSánchez,DanielF;Cui,JinZ;Lemay,SergeG
半导体聚合物链构成了各种电子材料和设备的构建模块。然而，它们在单分子水平上的大多数电特性很少受到关注。阐明这些属性可以帮助理解性能限制并启用新的应用程序。在这里，利用耦合离子-电子电荷传输来测量通过长单共轭聚合物链的准一维电流，因为它们与间隔约 10 nm 的电极形成瞬时接触。各个聚合物内部构象之间的波动被解决为电流中的突然的多级开关。这种行为与基于半柔性聚合物蠕虫链（WLC）模型的理论模拟一致。除了探索单个半导体聚合物链的固有特性之外，这些结果还为了解无规螺旋聚合物的动力学提供了前所未有的窗口，并使得能够使用半导体聚合物作为单分子（生物）传感测定的电标签。
Semiconducting polymer chains constitute the building blocks for a wide range of electronic materials and devices. However, most of their electrical characteristics at the single‐molecule level have received little attention. Elucidating these properties can help understanding performance limits and enable new applications. Here, coupled ionic–electronic charge transport is exploited to measure the quasi‐1D electrical current through long single conjugated polymer chains as they form transient contacts with electrodes separated by ≈10 nm. Fluctuations between internal conformations of the individual polymers are resolved as abrupt, multilevel switches in the electrical current. This behavior is consistent with the theoretical simulations based on the worm‐like‐chain (WLC) model for semiflexible polymers. In addition to probing the intrinsic properties of single semiconducting polymer chains, the results provide an unprecedented window into the dynamics of random‐coil polymers and enable the use of semiconducting polymers as electrical labels for single‐molecule (bio)sensing assays.